Thanks for the wise words guys. I am indeed chastened by this experience and a wiser rider now.
However, one of the main points I was tryingt to get across has perhaps been missed. I know how to adjust a turn, and am comfortable leaning harder when I realise I've gone in too hot (which I don't do often).
What got me this time was target fixation, the 'target' being the other bike.
Life is not a rehearsal - no, really it isn't